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Old 07-21-2012, 12:01 PM   #21
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I guess you guys have more stick/brick commercial construction where you're at. The only wood stud jobs I see are fast food, and low rise hotels.
Plus, I hardly EVER see a commercial project that allows the EC's to roll their own specs. Type NM is almost always excluded as an approved installation.
Here in New England we have supermarkets, office complexes, high rise apartment buildings, stores, and a multitude of other commercial occupancies wired entirely with NM cable.

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Old 07-21-2012, 12:09 PM   #22
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Here in New England we have supermarkets, office complexes, high rise apartment buildings, stores, and a multitude of other commercial occupancies wired entirely with NM cable.
No way!!!!!!!!!!

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Old 07-21-2012, 12:12 PM   #23
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It's funny that the only EMT in that pic is for the fire alarm system.
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Old 07-21-2012, 12:13 PM   #24
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It's funny that the only EMT in that pic is for the fire alarm system.
You are correct, its Providence .......

There are a couple of feeders in EMT but 99% of the power wiring is NM.
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Old 07-21-2012, 12:15 PM   #25
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You are correct, its Providence .......

There are a couple of feeders in EMT but 99% of the power wiring is NM.
I figured it was an RI job, only in RI do you see a building wired with NM cable, yet the 24 V fire alarm wiring has to be in metal conduit, without any splices allowed.
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Old 07-21-2012, 12:21 PM   #26
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Here in New England we have supermarkets, office complexes, high rise apartment buildings, stores, and a multitude of other commercial occupancies wired entirely with NM cable.
Were there any reports of people inhaling toxic fumes from fire when the NM burst into flame from spontaneous combustion?

I am looking for the reason it was banned above a suspended ceiling..

Other than making more money for the wire manufactures.. but we know that would never enter into a CMP decision..
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Old 07-21-2012, 12:23 PM   #27
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I am looking for the reason it was banned above a suspended ceiling..
It was a trade off with the steel tube folks. The rule prohibiting NM from being used more than 3 stories above grade was removed but the restriction above suspended ceilings went in.
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Old 07-21-2012, 12:24 PM   #28
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Were there any reports of people inhaling toxic fumes from fire when the NM burst into flame from spontaneous combustion?

I am looking for the reason it was banned above a suspended ceiling..

Other than making more money for the wire manufactures.. but we know that would never enter into a CMP decision..
No, and in fact they still allow PVC plumbing above suspended ceilings so it makes the reasoning all the more absurd.

The fact is there are probably hundreds of thousands of commercial buildings just here in my area wired in NM, and I don't see them burning down as a result.
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Old 07-21-2012, 03:17 PM   #29
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as long as you put grommet in your metal studs, romex is ok. Over here we can't use 14awg in commercial even if its a 15 amp breaker. have to pull 12awg.
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Old 07-21-2012, 07:16 PM   #30
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Were there any reports of people inhaling toxic fumes from fire when the NM burst into flame from spontaneous combustion?

I am looking for the reason it was banned above a suspended ceiling..
I think it has to do with the fact most suspended ceilings are use as return air plenums.
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Old 07-21-2012, 07:50 PM   #31
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It was a trade off with the steel tube folks. The rule prohibiting NM from being used more than 3 stories above grade was removed but the restriction above suspended ceilings went in.
Seems the NM lovers got the short end of the stick..

That code change knocks out 95% of the buildings around here since most are only one floor.. like strip malls.. shopping centers.. professional buildings..

Not too many hotels going up and I can't see them being wired in NM to begin with..
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Old 07-21-2012, 08:54 PM   #32
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I'd much rather pull NM then MC Of course I'd rather run conduit then anything. However smurf and MC are the way of the future. Been seeing less and less conduit lately. Ma ma ma Momma says MC is the devil!
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Old 07-21-2012, 10:13 PM   #33
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I think it has to do with the fact most suspended ceilings are use as return air plenums.
That was already handled by 300.22, 300.22 prevented NM in plenum ceilings long before the new rule.
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Old 07-21-2012, 11:41 PM   #34
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However smurf and MC are the way of the future.
God I hate smurf tube...
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Old 07-22-2012, 12:16 AM   #35
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God I hate smurf tube...
I'm with ya. I remember running some 2 inch or 2 1/2" smurf as a 1st year. The memory on that stuff really sucked! If it slipped outta your hand before you strapped it it would reel itself all the way backup on the spool! pain in the ass!
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Old 07-22-2012, 10:18 AM   #36
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God I hate smurf tube...

Amen....

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